How long does it take for the lithium polymer battery to charge for the first time?

Lithium polymer battery is a chemical battery with high energy, miniaturization and weight reduction. The following small series will introduce you to the correct lithium polymer battery charging method.

At present, lithium charging is mainly a voltage limiting current limiting method. The initial constant current (CC) charging has the strongest battery receiving capacity. As the charging process continues, the polarization is strengthened, the temperature rise is intensified, and the voltage rises. When the charging reaches about 70. At ~80%, the voltage reaches the maximum charge limit voltage and is switched to the constant voltage (CV) charge phase. In the constant voltage phase, there is a trickle charge, which takes about 30% of the time to charge 10% of the charge, the current intensity decreases, and the temperature rise does not increase.

This process considers the total voltage or average voltage control of the battery pack. In fact, there is always a higher cell voltage, and other batteries in the opposite group have entered the overcharge phase. Similarly, during discharge, there is an overdischarged battery in the group. Overcharge and overdischarge are fatal to the battery. The only difference is that overcharge generates a large amount of gas, is prone to spontaneous combustion and explosion, and the appearance is severe; The appearance changes slowly, but the failure speed is extremely fast, and should be strictly avoided in normal use.

In this regard, there is a new lithium battery charging method called parallel control and equalization management, which can charge and discharge management and equalization control for each power module. This dynamic equalization concentrates the two equalizations of discharge equalization and charge equalization. The advantage is that although the initial capacity, voltage, internal resistance and the like are different between the individual electric cores, the relative charge and discharge intensity and depth consistency can be ensured in the work, and the common end of life is gradually achieved. This method is especially suitable for high current discharge. Our company has developed PCB balance protection for up to 20 series of series lithium batteries, with a maximum discharge current of up to 100A.

Therefore, when charging the lithium battery, be sure to use a dedicated lithium battery charger, especially pay attention to the parameters of the battery used. It must be consistent. When the lithium battery is used in combination , be sure to add the battery pack. PCB protection board, it is possible to avoid the electric core package, leakage, and even fire, explosion, extend the battery life as long as possible, but not charge, increase the number of battery recycling.

Lithium polymer battery maintenance method

As a new battery product that has been innovated after the lithium-ion battery , lithium polymer batteries have some points to be aware of in their use. The following small series will introduce you to the maintenance method of lithium polymer battery.

First of all, it is a feature of lithium polymer batteries. Compared with lithium-ion batteries, lithium polymer batteries have improved the problem of battery leakage, but they have not been completely improved. In addition, the lithium polymer battery can be made into an ultra-thin battery, which can reach a capacity of 3.6V at 400 mAh in a thickness of 0.5 mm, and a lithium polymer battery is 10% higher than a conventional lithium ion battery in terms of discharge amount.

In daily use, as a kind of lithium ion battery, lithium polymer batteries are also often afraid of short, external short and overcharged inside the battery. The reason is because the chemical nature of lithium is very active. When the battery is discharged and charged, the inside of the battery will continue to heat up. When the temperature is too high, there will be a new Santana that may explode.

Therefore, when using the battery, try not to overcharge and discharge, that is, use the battery smoothly and in a planned manner, do not let the battery run out easily, and do not charge for a long time (usually 8 Within hours is the most appropriate).

The above is an introduction to the maintenance method of lithium polymer batteries. In addition, if you want to maintain the power of the lithium polymer battery, it is best to discharge it completely every month and then refill it once, which helps the battery to maintain power and longer life.

First, don't overcharge. (How long does it take?)

Lithium batteries have been activated at the factory, so now some businesses still have outdated "activation", it is very harmful. In fact, when the battery is fully charged, the overcharge protection circuit will be activated, the charging power will be cut off, the battery will start to discharge, and after a period of time, it will start to charge again, so that it will be alternately charged and replaced (see above for overcharge protection). Circuit principle). This way back and forth charging will actually shorten the battery charging cycle (later). Generally, lithium battery will be basically full in 2-3 hours, and after 90%, it will basically be a slow charging process. It will be enough to charge up to 1-2 hours. That is to charge 4-5 hours, not more than 6 hours.

The so-called new battery head is 3 hours in a row for 12 hours. It is already the old common sense of the nickel-hydrogen battery era. It is not impossible to charge it. You have no problem with charging. Lithium batteries have protection circuits, and the battery will not be broken. However, after the protection circuit works, the battery will enter a “put-charge-discharge” cycle, which is invisible to use the originally unnecessary charging cycle, which is reduced in disguise. The service life. It is not excluded that some poor quality lithium batteries will have problems after a long period of time.

Second, don't let go. (When should the battery be charged?)

Many people always think that there is an upper limit on the number of times that lithium battery is charged (in fact, it is not the number of times of powering, but the cycle of power--this later), so every time you use the battery as much as possible, it is not enough to turn off the power automatically. Not to charge, this is actually not good. It is easy to cause excessive discharge. Over-discharge has a direct impact on the life of the battery. It may be 1-2 times that a complete discharge will cause the battery to be scrapped. Therefore, the battery can be charged at 10%, and the minimum is not less than 3%.

The most likely over-discharge is when the mobile phone is used outside, the handle is used for automatic shutdown, and even the boot can not be turned on, but there is no charger, so that it can not be charged for a certain period of time, the result is that the battery is formed by self-discharge. Over-discharge, this is the most likely scenario. In another case, the battery is left unused for a long time, but there is not much power before storage, causing the battery to "chronic suicide."

At present, some equipment will remind you when the battery is still 5-10%, and then automatically shut down when the second reminder. It is estimated that the second time is also 2-3%, and the remaining power is very small. Therefore, it is strongly recommended that after the equipment is automatically shut down, you must not try to turn it on again. Charging as soon as possible is the most important thing. It is best to charge the battery before the first reminder.

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